Start separating the text track container from the media controls

Source/core/layout/LayoutTextTrackContainer.h

Index: Source/core/layout/LayoutTextTrackContainer.h
diff --git a/Source/core/layout/LayoutTextTrackContainerElement.h b/Source/core/layout/LayoutTextTrackContainer.h
similarity index 81%
rename from Source/core/layout/LayoutTextTrackContainerElement.h
rename to Source/core/layout/LayoutTextTrackContainer.h
index 71e8367fd10546adae822186a22de45d16ad9b28..98efe708cac6bbec26af37ae0bab9b640a4c7628 100644
--- a/Source/core/layout/LayoutTextTrackContainerElement.h
+++ b/Source/core/layout/LayoutTextTrackContainer.h
@@ -25,25 +25,23 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef LayoutTextTrackContainerElement_h
-#define LayoutTextTrackContainerElement_h
+#ifndef LayoutTextTrackContainer_h
+#define LayoutTextTrackContainer_h
 
-#include "core/html/shadow/MediaControlElements.h"
 #include "core/layout/LayoutBlockFlow.h"
-#include "core/layout/LayoutFlexibleBox.h"
 
 namespace blink {
 
-class LayoutTextTrackContainerElement final : public LayoutBlockFlow {
+class Element;
+
+class LayoutTextTrackContainer final : public LayoutBlockFlow {
 public:
-    LayoutTextTrackContainerElement(Element*);
+    LayoutTextTrackContainer(Element*);
 
 private:
     virtual void layout() override;
 };
 
-
 } // namespace blink
 
-#endif // LayoutTextTrackContainerElement_h
-
+#endif // LayoutTextTrackContainer_h